��� �D�`F15�X: ��� �5�bE�� "�D�&FF�WI#�3n�` � 0000001815 00000 n 0000050121 00000 n endstream endobj 191 0 obj<> endobj 192 0 obj<> endobj 193 0 obj<>/ColorSpace<>/Font<>/ProcSet[/PDF/Text/ImageB]/ExtGState<>>> endobj 194 0 obj<> endobj 195 0 obj[/ICCBased 208 0 R] endobj 196 0 obj<> endobj 197 0 obj<> endobj 198 0 obj<>stream 0000011229 00000 n 0000006156 00000 n 0000054752 00000 n �u�ص�w��}����>+��V�U���La�ɯo��`.zYjr�r=�e{��N� H����n7���:��H���5���.г����k�(����f�S`�/�(R�H�ے�װ�\b����JVH�ۗ��~��?>����ý��=d��_�~�=�?�6/|Z>o�_.˧�h��iI0|�)�1@����y���G��p�. In the left-hand cyclohexane chair, carbon atoms 1,3 and 5 are above an imaginary horizontal plane and … •All bond angles are 111° and all adjacent bonds are eclipsed. T_�,0nrf-��ׇ=�o���C=�jF��R�h2|kbd|�^�� b��`�(ب�l�v������� �0�pO�8 ��䰌��A�q�� H����Se�fb; ���i� •All bond angles are 111° and all adjacent bonds are eclipsed. %%EOF 0000055201 00000 n 0000001899 00000 n 0000014748 00000 n A Conformation of cyclohexane can refer to many 3-Dimensional shapes assumed by a cyclohexane molecule without disturbing the integrity of the chemical bonds in it. 0000056415 00000 n Cyclohexane is the most widely occurring ring in compounds of natural origin. The chair conformation is considerably more stable and comprises more than 99.9% of … H��WM��F��W�ިŰ��d��.��º�9�5RV#9�&����&դ83�``�&���҇�>+�xY|\->�VZ(��.T%+-*��\%��=��X=-*�U��X�%�*�zY|)>-�l�ݲT���R�B�J}X��#�������Ųt���o��:}���Z�՟��әU�K-Mq�g9/�k�����k�t�׻���]�.a��+��x2�*H(��e�3"���׵X��UQD\�Jy�C^���O1/�IOi�D�t���c}�풆�I�H��RA#e��-����f��t�n�ip'�����7g��5]��S�>��2����k�cY��C�?>Rj/�?D{==-Q��n�ݱ;�d�=w��}?qV��u@�e�L�h�r/�� .��;ۈ�V�8�Nqa�2��*. 0000050670 00000 n ]��E�:4.����w�K��*���{��2Y�C|:ű�v�vi[.�����wB+��{Bб\VŦ&��뇛��S11����iHr��b[V?߬ʭkŕ�[|����7�*�N�|�u~��k\���Wu�-*��%�Ds�U���6�J���)�~eԕ`�r�Ս�:Z�_"�/�s$�ݺ�+w����vm9�˲i��}�O��@{�G�w��~|�f��p�j@ù�����4�O�)�I� 0000003225 00000 n This allows us to investigate energy differences between different conformations. Nevertheless, the chair conformation is the most stable cyclohexane form. TWIST-BOAT CONFORMATION OF CYCLOHEXANE 29 . 0000056689 00000 n ���X@l�s" ��x�N.�n�}�v䴱Ϥ���T~x�>�]�Q�c�}�YֻW+� ؈v��5ة�^7�:wݍ�~��+��ɋm�q�[��ӷ�ܚf��b*~4ڸveءH�&W��N����|i*e�T��$��wSkv2t� �h �� H� � �h �� H� � � � �&���� �0H`h�D��6�����I��'G*���ذ��鍼X,�E�����Ynq'? Cyclohexane – conformations - most stable conformation is when methyl group is equatorial - when methyl group is placed axial, less stable conformation due to 1,3-diaxial interaction (as shown above) Isomers - different compounds with same molecular formula – … 0000003498 00000 n Cyclohexane (without any substituents) has two equivalent chair structures, both equal in energy and both exist in a 50:50 mixture. 28 . 0000050950 00000 n ���@� ��t� %PDF-1.4 %���� BOAT CONFORMATION OF CYCLOHEXANE 30 . _v/\�GQ@a�v�.�����BuXG�l����~w�N�{K��;��Q���$B�Ȥ¦���U$�H�8��i�� BG���q�� P6F� This means that cyclohexane has the same stability as a typical unbranched alkane. 0000052099 00000 n 0000049102 00000 n 436 0 obj <>/Filter/FlateDecode/ID[]/Index[389 60]/Info 388 0 R/Length 163/Prev 352069/Root 390 0 R/Size 449/Type/XRef/W[1 2 1]>>stream Additionally, either bond-line or Newman formulas reveal that the two hydrogen atoms at each CH2 are not the same. Stereochemistry, Conformation and Configuration Reference: P. Bruice, Organic Chemistry, 6th Edition, Chapters 2.1-2.15, 3.3-3.5, 5.1-5.8, ... Cyclohexane . h޴�mo�6ǿ 0000051464 00000 n 0000053498 00000 n 3.7: Conformations of Cyclohexane - ΔH comb suggests that cyclohexane is strain-free; favored conformation is a chair. 1 1 4 4 In the illustration above, the two chair conformations are in equilibrium. In the left-hand cyclohexane chair, carbon atoms 1,3 and 5 are above an imaginary horizontal plane and carbon atoms 2,4 and 6 … 0000053836 00000 n 0000047974 00000 n Three hydrogen atoms point straight up and three H's point straight down (at conformation “flips” into the other, the axial and equatorial hydrogens interconvert. conformation “flips” into the other, the axial and equatorial hydrogens interconvert. ��v�-�I������o�M}��X_�HH ������#h�f�M�ϟfC,�m����#ɢ(G�anupQN�?�Ս(�N����ƫ�4�����]�/��$��=��@|� �����?�Ar�h��p�3<9 /��cQ{t_���L��Y���TV/-�!��� [�I���h���R+G{��dC�gr=CmY:R[��j���̙j"��;ѶW\��&�+��#ř����N'��o��)�%���P��j�z���3TE��cU����آ��׆?�l֔E5����\���Nw�@��^"���qr���3��O�a%:^�^"�@�I���` ��I� �m'������V��"�w�9�>�|����1���^.p�C��xx������HqL�.�K��t���� ��в��`���!Z�'����b���#V���c�2RU�bQ_�p ����˸�h��\�&_�O��"�� ���f6Z��E�ED��U:�����A�_���ܚ�3�!\�$(%���M�L*"���������?�Ǥ���M@���� Z���1ѡN�+�9)�u14��������}]J����̐�ı�X�����l�6��� f�^I���Q�ܗV6��4��[������+�o�Y t�>�Q&%�M8�i�8��O%~��� 0 Once substituents begin to be added to the chair … Cyclohexane Conformation. 0000013314 00000 n 0000052915 00000 n 0000002642 00000 n D 3d contains 3C 2 perpendicular to C 3 with 3σ, S 6 axis and a centre of inversion.. Cyclohexane (Boat) Pointgroup Flow … 0000047309 00000 n endstream endobj startxref 3.7: Conformations of Cyclohexane - ΔH comb suggests that cyclohexane is strain-free; favored conformation is a chair. 0000002090 00000 n 0000049592 00000 n 0000003189 00000 n <<84C854B864A7924BA8A6B9A31AB1C689>]>> A regular hexagon shape contains internal angles of 120 o. 1 1 4 4 In the illustration above, the two chair conformations are in equilibrium. BOAT CONFORMATION OF CYCLOHEXANE 30 . ��������u�|�D�����}) "ߟcX�n�?­9M-�޵߻��H��ԥ ��I�������=w��/�B�����8���n����e�t�C�%�x�Twޯ�*]�>���ˮ;�ڨ$�J�*�k���u��l6�U�у ����q,�Ǜ�����2��zIMEZ'���-j�{\��� �`ylc�@�S��Ѻ�֯���|J��@L�� �G��ub{h���MV�@�����U\_�䵽 0000011878 00000 n CONFORMERS OF CYCLOHEXANE 31 . x�b```f``]���� �� Ā B,@Q�=r� ܧ����8��w�n&���7y �*����o����Ӂ��M��kUG��S ��8�^�lvY炋!��e ir��,�����8X�U�5�b�e�u�ƾ;_o�q�5��z9�h����(p�۷�� CZ�/f� � ��X� �e��@�������A؋@ek8e9��ۀ}����h�!����Av�Ӥ���� Conformation of ethane butane and cyclohexane: CONFORMATIONAL ANALYSIS: If two different 3D arrangements in space of the atoms in a molecule are interconvertible merely by free rotation about bonds, they are called conformations. trailer 0000001356 00000 n 28 . Conformations of a cyclohexane¶ The geometry optimsation procedures in QM software involve local optimisation of the energy, not global optimisation. Cyclohexane ClhCyclohexane avoids ti ltorsional it tiinteractions byadtidopting non-pllanar conftiformations, which also reduces the bond angles to that of a perfect tetrahedron (~109.5°). TWIST-BOAT CONFORMATION OF CYCLOHEXANE 29 . CONFORMERS OF CYCLOHEXANE 31 . 0000046767 00000 n 0000055431 00000 n 0000046226 00000 n to separate cyclohexane at room temperature into pure isomeric forms that correspond to these conformations, and actually the two forms appear to be rapidly interconverted. CHAIR CONFORMATION OF CYCLOHEXANE •The chair conformer of cyclohexane is completely free of strain. 0000056171 00000 n A Newman projection of a chair conformation of cyclohexane clearly shows that torsional strain is minimized, since all groups are staggered. If they are not interconvertible, they are called configurations. xref 0000051740 00000 n 0000009910 00000 n 190 53 %%EOF 0000047772 00000 n 0000003575 00000 n 389 0 obj <> endobj We are going to look at the difference in energy between conformations of 1,4-dichloro-cyclohexane. The conformation in which the methyl group is equatorial is more stable, and thus the equilibrium lies in this direction. h�b```f``����� �� �� ,l@���M���B�*|Ğ�l,��#��/X'Q�v�SV�2�Z���4E6��m�O�$R���xX ^�Q0,44l��F`���}o�X��~�v�k߃��2�`���}r?�n�~h�y��߮�u�oj����fY�����q��z�m�7���``��``P�`��`�hp� �l ����� � ������$:H� ��O�@�b[p��3�2;|ٶ%x�����ƧBEbJ�K�a�u2���b§��1��QJP!��ЃL�^��8/����4����q�ķ��y�3[ ���,W����pt�Ẩ�;�Q�#@ �R���!|F� �T�� 0000012120 00000 n 0000000016 00000 n 7.2 CONFORMATIONS OF CYCLOHEXANE 269 exactly the same contribution to its heat of formation ( -20.7 kJ mol_1 or -4.95 kcal mol_1). 0000049392 00000 n 0000055673 00000 n 242 0 obj<>stream A cyclohexane conformation is any of several three-dimensional shapes adopted by a cyclohexane molecule.Because many compounds feature structurally similar six-membered rings, the structure and dynamics of cyclohexane are important prototypes of a wide range of compounds. 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conformation of cyclohexane pdf

0000007445 00000 n The chair conformation of cyclohexane is the most stable. It has no torsional strain as 448 0 obj <>stream CHAIR CONFORMATION OF CYCLOHEXANE •The chair conformer of cyclohexane is completely free of strain. �]o����_������zY� �&D� �գ7�t��"��`� 7�9����s� #&H�n�17��$Q���y���F�%$�$;@jq��c��r���ƍVB����uo�����l�Q�B6�G�H�+�� ׮,ɳ&��O�=����V��ۄ�7{��3�\i;|���:{D�'��9k�K^&������z�E|�J�bJ�t JLc��Ĕ�#[6��q�l�����$��eǔ�� The cyclohexane structure will continuously flip from one conformation to another. 0000045953 00000 n 0000004928 00000 n �5J���������YE^�������4U�&�. 0000054284 00000 n �0 �H�_ ���w+H[.�`r �L@D��bI�Q �f��q$Vbe”0>��� �D�`F15�X: ��� �5�bE�� "�D�&FF�WI#�3n�` � 0000001815 00000 n 0000050121 00000 n endstream endobj 191 0 obj<> endobj 192 0 obj<> endobj 193 0 obj<>/ColorSpace<>/Font<>/ProcSet[/PDF/Text/ImageB]/ExtGState<>>> endobj 194 0 obj<> endobj 195 0 obj[/ICCBased 208 0 R] endobj 196 0 obj<> endobj 197 0 obj<> endobj 198 0 obj<>stream 0000011229 00000 n 0000006156 00000 n 0000054752 00000 n �u�ص�w��}����>+��V�U���La�ɯo��`.zYjr�r=�e{��N� H����n7���:��H���5���.г����k�(����f�S`�/�(R�H�ے�װ�\b����JVH�ۗ��~��?>����ý��=d��_�~�=�?�6/|Z>o�_.˧�h��iI0|�)�1@����y���G��p�. In the left-hand cyclohexane chair, carbon atoms 1,3 and 5 are above an imaginary horizontal plane and … •All bond angles are 111° and all adjacent bonds are eclipsed. T_�,0nrf-��ׇ=�o���C=�jF��R�h2|kbd|�^�� b��`�(ب�l�v������� �0�pO�8 ��䰌��A�q�� H����Se�fb; ���i� •All bond angles are 111° and all adjacent bonds are eclipsed. %%EOF 0000055201 00000 n 0000001899 00000 n 0000014748 00000 n A Conformation of cyclohexane can refer to many 3-Dimensional shapes assumed by a cyclohexane molecule without disturbing the integrity of the chemical bonds in it. 0000056415 00000 n Cyclohexane is the most widely occurring ring in compounds of natural origin. The chair conformation is considerably more stable and comprises more than 99.9% of … H��WM��F��W�ިŰ��d��.��º�9�5RV#9�&����&դ83�``�&���҇�>+�xY|\->�VZ(��.T%+-*��\%��=��X=-*�U��X�%�*�zY|)>-�l�ݲT���R�B�J}X��#�������Ųt���o��:}���Z�՟��әU�K-Mq�g9/�k�����k�t�׻���]�.a��+��x2�*H(��e�3"���׵X��UQD\�Jy�C^���O1/�IOi�D�t���c}�풆�I�H��RA#e��-����f��t�n�ip'�����7g��5]��S�>��2����k�cY��C�?>Rj/�?D{==-Q��n�ݱ;�d�=w��}?qV��u@�e�L�h�r/�� .��;ۈ�V�8�Nqa�2��*. 0000050670 00000 n ]��E�:4.����w�K��*���{��2Y�C|:ű�v�vi[.�����wB+��{Bб\VŦ&��뇛��S11����iHr��b[V?߬ʭkŕ�[|����7�*�N�|�u~��k\���Wu�-*��%�Ds�U���6�J���)�~eԕ`�r�Ս�:Z�_"�/�s$�ݺ�+w����vm9�˲i��}�O��@{�G�w��~|�f��p�j@ù�����4�O�)�I� 0000003225 00000 n This allows us to investigate energy differences between different conformations. Nevertheless, the chair conformation is the most stable cyclohexane form. TWIST-BOAT CONFORMATION OF CYCLOHEXANE 29 . 0000056689 00000 n ���X@l�s" ��x�N.�n�}�v䴱Ϥ���T~x�>�]�Q�c�}�YֻW+� ؈v��5ة�^7�:wݍ�~��+��ɋm�q�[��ӷ�ܚf��b*~4ڸveءH�&W��N����|i*e�T��$��wSkv2t� �h �� H� � �h �� H� � � � �&���� �0H`h�D��6�����I��'G*���ذ��鍼X,�E�����Ynq'? Cyclohexane – conformations - most stable conformation is when methyl group is equatorial - when methyl group is placed axial, less stable conformation due to 1,3-diaxial interaction (as shown above) Isomers - different compounds with same molecular formula – … 0000003498 00000 n Cyclohexane (without any substituents) has two equivalent chair structures, both equal in energy and both exist in a 50:50 mixture. 28 . 0000050950 00000 n ���@� ��t� %PDF-1.4 %���� BOAT CONFORMATION OF CYCLOHEXANE 30 . _v/\�GQ@a�v�.�����BuXG�l����~w�N�{K��;��Q���$B�Ȥ¦���U$�H�8��i�� BG���q�� P6F� This means that cyclohexane has the same stability as a typical unbranched alkane. 0000052099 00000 n 0000049102 00000 n 436 0 obj <>/Filter/FlateDecode/ID[]/Index[389 60]/Info 388 0 R/Length 163/Prev 352069/Root 390 0 R/Size 449/Type/XRef/W[1 2 1]>>stream Additionally, either bond-line or Newman formulas reveal that the two hydrogen atoms at each CH2 are not the same. Stereochemistry, Conformation and Configuration Reference: P. Bruice, Organic Chemistry, 6th Edition, Chapters 2.1-2.15, 3.3-3.5, 5.1-5.8, ... Cyclohexane . h޴�mo�6ǿ 0000051464 00000 n 0000053498 00000 n 3.7: Conformations of Cyclohexane - ΔH comb suggests that cyclohexane is strain-free; favored conformation is a chair. 1 1 4 4 In the illustration above, the two chair conformations are in equilibrium. In the left-hand cyclohexane chair, carbon atoms 1,3 and 5 are above an imaginary horizontal plane and carbon atoms 2,4 and 6 … 0000053836 00000 n 0000047974 00000 n Three hydrogen atoms point straight up and three H's point straight down (at conformation “flips” into the other, the axial and equatorial hydrogens interconvert. conformation “flips” into the other, the axial and equatorial hydrogens interconvert. ��v�-�I������o�M}��X_�HH ������#h�f�M�ϟfC,�m����#ɢ(G�anupQN�?�Ս(�N����ƫ�4�����]�/��$��=��@|� �����?�Ar�h��p�3<9 /��cQ{t_���L��Y���TV/-�!��� [�I���h���R+G{��dC�gr=CmY:R[��j���̙j"��;ѶW\��&�+��#ř����N'��o��)�%���P��j�z���3TE��cU����آ��׆?�l֔E5����\���Nw�@��^"���qr���3��O�a%:^�^"�@�I���` ��I� �m'������V��"�w�9�>�|����1���^.p�C��xx������HqL�.�K��t���� ��в��`���!Z�'����b���#V���c�2RU�bQ_�p ����˸�h��\�&_�O��"�� ���f6Z��E�ED��U:�����A�_���ܚ�3�!\�$(%���M�L*"���������?�Ǥ���M@���� Z���1ѡN�+�9)�u14��������}]J����̐�ı�X�����l�6��� f�^I���Q�ܗV6��4��[������+�o�Y t�>�Q&%�M8�i�8��O%~��� 0 Once substituents begin to be added to the chair … Cyclohexane Conformation. 0000013314 00000 n 0000052915 00000 n 0000002642 00000 n D 3d contains 3C 2 perpendicular to C 3 with 3σ, S 6 axis and a centre of inversion.. Cyclohexane (Boat) Pointgroup Flow … 0000047309 00000 n endstream endobj startxref 3.7: Conformations of Cyclohexane - ΔH comb suggests that cyclohexane is strain-free; favored conformation is a chair. 0000002090 00000 n 0000049592 00000 n 0000003189 00000 n <<84C854B864A7924BA8A6B9A31AB1C689>]>> A regular hexagon shape contains internal angles of 120 o. 1 1 4 4 In the illustration above, the two chair conformations are in equilibrium. BOAT CONFORMATION OF CYCLOHEXANE 30 . ��������u�|�D�����}) "ߟcX�n�?­9M-�޵߻��H��ԥ ��I�������=w��/�B�����8���n����e�t�C�%�x�Twޯ�*]�>���ˮ;�ڨ$�J�*�k���u��l6�U�у ����q,�Ǜ�����2��zIMEZ'���-j�{\��� �`ylc�@�S��Ѻ�֯���|J��@L�� �G��ub{h���MV�@�����U\_�䵽 0000011878 00000 n CONFORMERS OF CYCLOHEXANE 31 . x�b```f``]���� �� Ā B,@Q�=r� ܧ����8��w�n&���7y �*����o����Ӂ��M��kUG��S ��8�^�lvY炋!��e ir��,�����8X�U�5�b�e�u�ƾ;_o�q�5��z9�h����(p�۷�� CZ�/f� � ��X� �e��@�������A؋@ek8e9��ۀ}����h�!����Av�Ӥ���� Conformation of ethane butane and cyclohexane: CONFORMATIONAL ANALYSIS: If two different 3D arrangements in space of the atoms in a molecule are interconvertible merely by free rotation about bonds, they are called conformations. trailer 0000001356 00000 n 28 . Conformations of a cyclohexane¶ The geometry optimsation procedures in QM software involve local optimisation of the energy, not global optimisation. Cyclohexane ClhCyclohexane avoids ti ltorsional it tiinteractions byadtidopting non-pllanar conftiformations, which also reduces the bond angles to that of a perfect tetrahedron (~109.5°). TWIST-BOAT CONFORMATION OF CYCLOHEXANE 29 . CONFORMERS OF CYCLOHEXANE 31 . 0000046767 00000 n 0000055431 00000 n 0000046226 00000 n to separate cyclohexane at room temperature into pure isomeric forms that correspond to these conformations, and actually the two forms appear to be rapidly interconverted. CHAIR CONFORMATION OF CYCLOHEXANE •The chair conformer of cyclohexane is completely free of strain. 0000056171 00000 n A Newman projection of a chair conformation of cyclohexane clearly shows that torsional strain is minimized, since all groups are staggered. If they are not interconvertible, they are called configurations. xref 0000051740 00000 n 0000009910 00000 n 190 53 %%EOF 0000047772 00000 n 0000003575 00000 n 389 0 obj <> endobj We are going to look at the difference in energy between conformations of 1,4-dichloro-cyclohexane. The conformation in which the methyl group is equatorial is more stable, and thus the equilibrium lies in this direction. h�b```f``����� �� �� ,l@���M���B�*|Ğ�l,��#��/X'Q�v�SV�2�Z���4E6��m�O�$R���xX ^�Q0,44l��F`���}o�X��~�v�k߃��2�`���}r?�n�~h�y��߮�u�oj����fY�����q��z�m�7���``��``P�`��`�hp� �l ����� � ������$:H� ��O�@�b[p��3�2;|ٶ%x�����ƧBEbJ�K�a�u2���b§��1��QJP!��ЃL�^��8/����4����q�ķ��y�3[ ���,W����pt�Ẩ�;�Q�#@ �R���!|F� �T�� 0000012120 00000 n 0000000016 00000 n 7.2 CONFORMATIONS OF CYCLOHEXANE 269 exactly the same contribution to its heat of formation ( -20.7 kJ mol_1 or -4.95 kcal mol_1). 0000049392 00000 n 0000055673 00000 n 242 0 obj<>stream A cyclohexane conformation is any of several three-dimensional shapes adopted by a cyclohexane molecule.Because many compounds feature structurally similar six-membered rings, the structure and dynamics of cyclohexane are important prototypes of a wide range of compounds. 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